body{
  display: flex;
  height: 100vh;
  justify-content: center; 
  align-items: center;
}

#wrapBg{
  width: 343px;
  height: 480px;
  background: url('./img/bg.jpg');
  position: relative;
  overflow: hidden;
}

#headTitle{
  width: 236px;
  height: 77px;
  background: url('./img/head.jpg');
  position: absolute;
  left: 53px;
  top: 100px;
}

#headBird{
  position: absolute;
  right: 0;
  top: 25px;
}

#statrtBtn{
  width: 85px;
  height: 29px;
  background: url('./img/start.jpg');
  position: absolute;
  left: 129px;
  top: 250px;
}
#grassLand1{
  width: 343px;
  height: 14px;
  background: url('./img/banner.jpg');
  position: absolute;
  top: 423px;
  left: 0;
}
#grassLand2{
  width: 343px;
  height: 14px;
  background: url('./img/banner.jpg');
  position: absolute;
  top: 423px;
  left: 100%;
}